ORIGINAL: ianober
Agree, the center of the hinge point should be aligned with the center of the axis of pivot. Thats how I do all my hinges. If not, which you could do, your shrouds will rub on the control surface. But thats just my opinion, I could be wrong.
Since your rudder leading edge is curved (convex) I assume the fin where it attaches is curved in (concave). If so, both you and ianober are correct. If, on the other hand your fin trailing edge is flat, then you would not need to embed the hinge point.
Craig